diff --git a/PC/dllbase_nt.txt b/PC/dllbase_nt.txt
index 944ef958127..c06e497e751 100644
--- a/PC/dllbase_nt.txt
+++ b/PC/dllbase_nt.txt
@@ -33,6 +33,7 @@ More standard extensions 1D100000 - 1e000000
  - bZ2                       1D170000 - 1D180000
  - datetime                  1D180000 - 1D190000    pyd removed in 2.4
  - _csv                      1D190000 - 1D1A0000    pyd removed in 2.4
+ - _ctypes                   1D1A0000 - 1D1B0000
 
 Other extension modules
  - win32api                  1e200000 - 1e220000
diff --git a/PCbuild/_ctypes.vcproj b/PCbuild/_ctypes.vcproj
index 76518e69530..4990c9eb020 100644
--- a/PCbuild/_ctypes.vcproj
+++ b/PCbuild/_ctypes.vcproj
@@ -33,12 +33,14 @@
 				Name="VCCustomBuildTool"/>
 			<Tool
 				Name="VCLinkerTool"
+				AdditionalOptions="/EXPORT:DllGetClassObject,PRIVATE /EXPORT:DllCanUnloadNow,PRIVATE"
 				OutputFile="./_ctypes_d.pyd"
 				LinkIncremental="1"
 				SuppressStartupBanner="TRUE"
 				GenerateDebugInformation="TRUE"
 				ProgramDatabaseFile=".\./_ctypes_d.pdb"
 				SubSystem="0"
+				BaseAddress="0x1D1A0000"
 				ImportLibrary=".\./_ctypes_d.lib"
 				TargetMachine="1"/>
 			<Tool
@@ -85,6 +87,7 @@
 				Name="VCCustomBuildTool"/>
 			<Tool
 				Name="VCLinkerTool"
+				AdditionalOptions="/EXPORT:DllGetClassObject,PRIVATE /EXPORT:DllCanUnloadNow,PRIVATE"
 				OutputFile="./_ctypes.pyd"
 				LinkIncremental="1"
 				SuppressStartupBanner="TRUE"
@@ -93,6 +96,7 @@
 				SubSystem="0"
 				OptimizeReferences="0"
 				EnableCOMDATFolding="0"
+				BaseAddress="0x1D1A0000"
 				ImportLibrary=".\./_ctypes.lib"
 				TargetMachine="1"/>
 			<Tool
@@ -142,7 +146,7 @@
 				Name="VCCustomBuildTool"/>
 			<Tool
 				Name="VCLinkerTool"
-				AdditionalOptions=" /MACHINE:AMD64 /USELINK:MS_SDK"
+				AdditionalOptions=" /MACHINE:AMD64 /USELINK:MS_SDK /EXPORT:DllGetClassObject,PRIVATE /EXPORT:DllCanUnloadNow,PRIVATE"
 				OutputFile="./_ctypes.pyd"
 				LinkIncremental="1"
 				SuppressStartupBanner="TRUE"
@@ -151,6 +155,7 @@
 				SubSystem="0"
 				OptimizeReferences="0"
 				EnableCOMDATFolding="0"
+				BaseAddress="0x1D1A0000"
 				ImportLibrary=".\./_ctypes.lib"
 				TargetMachine="0"/>
 			<Tool
@@ -200,7 +205,7 @@
 				Name="VCCustomBuildTool"/>
 			<Tool
 				Name="VCLinkerTool"
-				AdditionalOptions=" /MACHINE:IA64 /USELINK:MS_SDK"
+				AdditionalOptions=" /MACHINE:IA64 /USELINK:MS_SDK /EXPORT:DllGetClassObject,PRIVATE /EXPORT:DllCanUnloadNow,PRIVATE"
 				OutputFile="./_ctypes.pyd"
 				LinkIncremental="1"
 				SuppressStartupBanner="TRUE"
@@ -209,6 +214,7 @@
 				SubSystem="0"
 				OptimizeReferences="0"
 				EnableCOMDATFolding="0"
+				BaseAddress="0x1D1A0000"
 				ImportLibrary=".\./_ctypes.lib"
 				TargetMachine="0"/>
 			<Tool